package com.example.wuziqi;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class WuziqiPanel extends View {

    private int mPanelWidth;
    private float mLineHeight;
    private int MAX_LINE = 10 ;
    private int MAX_COUNT_IN_LINE = 5;

    private Paint mPaint = new Paint();

    private Bitmap mWhitePiece;
    private Bitmap mBlackPiece;

    private float ratioPieceOfLineHeight = 3 * 1.0f /4;

    private boolean mIsWhite = true;
    private ArrayList<Point> mWhiteArray = new ArrayList<>();
    private ArrayList<Point> mBlackArray = new ArrayList<>();

    private boolean mIsGameOver;
    private boolean mIsWhiteWinner;

    public WuziqiPanel(Context context,  AttributeSet attrs) {
        super(context, attrs);
        setBackgroundColor(0x44ff0000);
        init();
    }

    private void init() {
        mPaint.setColor(0x88000000);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);

        mWhitePiece = BitmapFactory.decodeResource(getResources(),R.drawable.stone_w2);
        mBlackPiece= BitmapFactory.decodeResource(getResources(),R.drawable.stone_b1);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);

        int heightSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(widthMeasureSpec);

        int width = Math.min(widthSize,heightSize);

        if (widthMode == MeasureSpec.UNSPECIFIED){
            width = heightSize;
        }else if(heightMode == MeasureSpec.UNSPECIFIED){
            width = widthSize;
        }
        setMeasuredDimension(width,width);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        mPanelWidth = w;
        mLineHeight = mPanelWidth *1.0f /MAX_LINE;

        int pieceWidth = (int) (mLineHeight* ratioPieceOfLineHeight);
        mWhitePiece = Bitmap.createScaledBitmap(mWhitePiece,pieceWidth,pieceWidth,false);
        mBlackPiece = Bitmap.createScaledBitmap(mBlackPiece,pieceWidth,pieceWidth,false);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(mIsGameOver) return false;
        int action = event.getAction();
        if (action == MotionEvent.ACTION_UP){
            int x= (int) event.getX();
            int y = (int) event.getY();

            Point p = getValidPoint(x,y);
            if (mWhiteArray.contains(p) || mBlackArray.contains(p)){
                return false;
            }

            if (mIsWhite){
                mWhiteArray.add(p);
            }else {
                mBlackArray.add(p);
            }
            invalidate();
            mIsWhite = !mIsWhite;
        }
        return true;
    }

    private Point getValidPoint(int x, int y) {
        return new Point((int)(x/mLineHeight),(int)(y/mLineHeight));
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        drawBoard(canvas);
        drawPieces(canvas);
        checkGameOver();
    }

    private void checkGameOver() {
        boolean whiteWin=checkFiveInLine(mWhiteArray);
        boolean blackWin=checkFiveInLine(mBlackArray);

        if (whiteWin || blackWin){
            mIsGameOver = true;
            mIsWhiteWinner = whiteWin;

            String text = mIsWhiteWinner?"白棋胜利":"黑棋胜利";
            Toast.makeText(getContext(),text,Toast.LENGTH_SHORT).show();

        }
    }

    private boolean checkFiveInLine(List<Point> points) {
        for (Point p : points){
            int x = p.x;
            int y = p.y;

            boolean win = checkHorizontal(x,y,points);
            if (win) return true;
            win = checkVertical(x,y,points);
            if (win) return true;
            win = checkLeftDiagonal(x,y,points);
            if (win) return true;
            win = checkRightDiagonal(x,y,points);
            if (win) return true;

        }
        return false;
    }

    private boolean checkHorizontal(int x, int y, List<Point> points) {
        int count = 1;
        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x-i,y))){
                count++;
            }else {
                break;
            }
        }

        if (count == MAX_COUNT_IN_LINE) return true;

        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x+i,y))){
                count++;
            }else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;
    }

    private boolean checkVertical(int x, int y, List<Point> points) {
        int count = 1;
        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x,y-i))){
                count++;
            }else {
                break;
            }
        }

        if (count == MAX_COUNT_IN_LINE) return true;

        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x,y+i))){
                count++;
            }else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;
    }


    private boolean checkRightDiagonal(int x, int y, List<Point> points) {
        int count = 1;
        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x-i,y-i))){
                count++;
            }else {
                break;
            }
        }

        if (count == MAX_COUNT_IN_LINE) return true;

        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x+i,y+i))){
                count++;
            }else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;
    }


    private boolean checkLeftDiagonal(int x, int y, List<Point> points) {
        int count = 1;
        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x-i,y+i))){
                count++;
            }else {
                break;
            }
        }

        if (count == MAX_COUNT_IN_LINE) return true;

        for (int i =1;i<MAX_COUNT_IN_LINE;i++){
            if (points.contains(new Point(x+i,y-i))){
                count++;
            }else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;
    }

    private void drawPieces(Canvas canvas) {
        for (int i =0,n=mWhiteArray.size();i<n;i++){
            Point whitePoint = mWhiteArray.get(i);
            canvas.drawBitmap(mWhitePiece,
                    (whitePoint.x+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    (whitePoint.y+(1-ratioPieceOfLineHeight)/2)*mLineHeight,null);

        }

        for (int i =0,n=mBlackArray.size();i<n;i++){
            Point blackPoint = mBlackArray.get(i);
            canvas.drawBitmap(mBlackPiece,
                    (blackPoint.x+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    (blackPoint.y+(1-ratioPieceOfLineHeight)/2)*mLineHeight,null);

        }
    }

    private void drawBoard(Canvas canvas) {
         int w = mPanelWidth;
         float lineHeight = mLineHeight;

         for(int i =0;i<MAX_LINE;i++){
             int startX = (int) (lineHeight/2);
             int endX = (int) (w-lineHeight/2);
             int y = (int) ((0.5 + i)*lineHeight);
             canvas.drawLine(startX, y ,endX ,y,mPaint);
             canvas.drawLine(y,startX,y,endX,mPaint);
         }
    }


    private static final String INSTANCE = "instance";
    private static final String INSTANCE_GAME_OVER = "instance_game_over";
    private static final String INSTANCE_WHITE_ARRAY = "instance_white_array";
    private static final String INSTANCE_BlACK_ARRAY = "instance_black_aaray";
    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle bundle = new Bundle();
        bundle.putParcelable(INSTANCE,super.onSaveInstanceState());
        bundle.putBoolean(INSTANCE_GAME_OVER,mIsGameOver);
        bundle.putParcelableArrayList(INSTANCE_WHITE_ARRAY,mWhiteArray);
        bundle.putParcelableArrayList(INSTANCE_BlACK_ARRAY,mBlackArray);
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle){
            Bundle bundle = (Bundle) state;
            mIsGameOver = bundle.getBoolean(INSTANCE_GAME_OVER);
            mWhiteArray = bundle.getParcelableArrayList(INSTANCE_WHITE_ARRAY);
            mBlackArray = bundle.getParcelableArrayList(INSTANCE_BlACK_ARRAY);
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE));
            return;
        }
        super.onRestoreInstanceState(state);
    }
}
